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Kwiat Lab
United States
เข้าร่วมเมื่อ 31 ส.ค. 2018
Lab equipment and technique tutorials for everyone! ...and specifically new members in training in the Kwiat research group.
Ep. 10 CW Ti:Sapphire Laser Turn-on, Use, and Alignment Instructions
We have a Spectra-Physics 3900s laser which is being pumped by a Millenia Pro 10s. In this video, I show how to turn on the system and do some daily alignment optimization. I also describe how to align the laser if it needs to resetup on another table or if the 3900s and the Milenia Pro become misaligned from one another. Finally, there's a bonus discussion about how to operate the laser in current mode, instead of the normal power mode (in general not needed but included for completeness).
Sorry about the scratchy-electronic background noise, especially at the beginning. I tried Windows Movies and TV video editor for this one and it didn't work preserve the audio well.
Sorry about the scratchy-electronic background noise, especially at the beginning. I tried Windows Movies and TV video editor for this one and it didn't work preserve the audio well.
มุมมอง: 4 255
วีดีโอ
Ep. 9 Quantum-Tomography Library Tut | Python Example
มุมมอง 1.9K4 ปีที่แล้ว
In this video series you’ll learn how to use a python library called Quantum-Tomography in order to help measure quantum states in your experiments. This library is useful for anyone who wants to efficiently preform tomography on a large number of states or simply play around with tomography. This library was created by the Kwiat Quantum Information Group. Our website is available here : resear...
Ep. 8 Quantum-Tomography Library Tut | Library Introduction
มุมมอง 2.5K4 ปีที่แล้ว
In this video series you’ll learn how to use a python library called Quantum-Tomography in order to help measure quantum states in your experiments. This library is useful for anyone who wants to efficiently preform tomography on a large number of states or simply play around with tomography. This library was created by the Kwiat Quantum Information Group. Our website is available here : resear...
Ep. 7 Optical Fiber Cleaving and Fusion Splicing
มุมมอง 1.1K4 ปีที่แล้ว
Tutorial on how to cleave and fusion splice optical fiber using Fitel equipment by Joseph Chapman.
Ep. 6 Quantum Process Tomography
มุมมอง 3.4K4 ปีที่แล้ว
Tutorial on the basic theory of quantum process tomography by Spencer Johnson. Slides for the presentation (and all others) can be found here: drive.google.com/open?id=1NEjuxCWqNX63Grvmtjzv-5Tob1zUSDIY
Ep. 5 Quantum State Tomography
มุมมอง 11K4 ปีที่แล้ว
Tutorial on the theory of quantum state tomography by Spencer Johnson. This tutorial focuses on basic theory of quantum state tomography and is focused on the application of the tomography of photon polarization qubits. Slides for the presentation (and all others) can be found here: drive.google.com/open?id=1NEjuxCWqNX63Grvmtjzv-5Tob1zUSDIY
Ep. 4 Setting up Pulsed Laser Diode Driver
มุมมอง 2.7K5 ปีที่แล้ว
Tutorial on setting up periodic laser diode driver using a phase-locked loop on an Intel FPGA Terasic Demo Board. Phase-locked loop basics, quartus project setup, systemverilog code, and FPGA programming in quartus are all covered. Additionally, gain-switching a laser diode is described for creation of very short laser pulses (100 ps or less) and a circuit is shown for doing so along with tips ...
Ep. 3 Timetagger
มุมมอง 6405 ปีที่แล้ว
Tutorial on how to setup a UQDevices UQD-Logic-16 timetagger and use it with our analysis software written by Daniel Kumor. Video includes tips on anaylsis in matlab and python, synchronization of multiple timetaggers, and single photon detector characterization. Slides for the presentation (and all others) can be found here: drive.google.com/open?id=1NEjuxCWqNX63Grvmtjzv-5Tob1zUSDIY
Ep. 2 Interferometry
มุมมอง 3876 ปีที่แล้ว
Tutorial on different type of interferometers and how to align them by eye/camera and with a wavefront sensor. Slides for the presentation (and all others) can be found here: drive.google.com/drive/folders/1NEjuxCWqNX63Grvmtjzv-5Tob1zUSDIY?usp=sharing
Ep. 1 Wavefront Sensor
มุมมอง 7K6 ปีที่แล้ว
Tutorial on modern wavefront sensing technology. Introduction to wavefront sensing technology. Description of how to use the Thorlabs wavefront sensor software and the Phasics wavefront sensor software. Slides for the presentation (and all others) can be found here: drive.google.com/drive/folders/1NEjuxCWqNX63Grvmtjzv-5Tob1zUSDIY?usp=sharing
Blue laser for direct diode pumping of Ti:Sapphire laser th-cam.com/video/mWlZ9oOJVcA/w-d-xo.html
What a great video, thank you so much!
Does this laser ionize the air around it?
I really enjoyed this, even with the background noise. Oddly I think it helped. I would love 5 minutes of this guys time to question him on pulsed diode lasers. Regardless, thanks for the upload Kwiat Lab.
Very useful explanation. Thx for your presentation
Why was the power meter set to 532nm?
thanks a lot for lecture and I have question can we the qiskit to perform the qunatum state tomography and how can we use it?
Hello, how much is the maximum pump power that we can use for our spectra physics Ti: sahire CW laser (model 3900 s)? How much maximum power density that handle by the ti:sapphire crystal? Is the beam size is important when we choose a pump laser for 3900 -s CW laser? How much is the damage threshold of the mirrors used in the cavity?
great presentation. i want a circuit diagram to run my laser diode, now i have to learn programming fpga :)
Did you get feedback? What’s going on with ur FPGA circuits programming
Awesome laser content!
great, thanks, it gave me better general view rather than old manual given with tools
I liked you video, but kinda wished you'd left in more of the conversation you were having with the other guy. I work with a Tsunami with a similar 10W Millennia Pro. One of the previous laser scientist enclosed our system and set up a shutter to the oscillator output so it could be safely run 24/7... no warm up cycles on the diodes, cavity, or the surrounding hardware. It's very stable and the diodes have lasted over a decade..
Very Nice!!! Where I can to buy
A box fan to cool the chiller?
I find this presentation very helpful, thanks a lot
how can i import TimeTagger library. i got error like ; No modul found "TimeTagger"
Thanks for sharing. So time tagger does not say the time exactly. You need to set it for a t=0 point. Is it true?
It isn't synced up with normal time. It is like an extremely fast stop watch that starts counting when its turned on. When an event occurs on a channel, the timetagger flags what time (relative to when the machine was turned on) it occurred and what channel it happened on. I don't think this particular unit has a way to reset the time to zero without turning it off and on again.
Great presentation Spencer. Can this be used to counter quantum cryptography? By this I mean can a person listening to a network reconstruct the quantum states being sent and intercept the connection?
Sorry for the delay in response. Spencer has been busy. This can not be used to counter quantum cryptography if you're trying to determine what the quantum state of the photon being sent during quantum key distribution is. Quantum state tomography needs many copies of the exact same state to determine what that state is using the different measurements of a tomography. It isn't possible to deterministically determine a general quantum state with a single measurement. Since quantum tomography depends on many copies of an IDENTICAL state and quantum key distribution randomly uses DIFFERENT states, it isn't possible to perfectly eavesdrop using quantum state tomography. It is possible to extract some information sometimes with eavesdropping on quantum key distribution but QKD has the novel feature that it can detect eavesdropping since that introduces errors into the key. See our animation: research.physics.illinois.edu/QI/Photonics/movies/bb84.swf
RSA is linear to compute the key, the reverse process is exponential, if you have exponential power to break the key, then they will have double exponential to protect the key, So quantum RSA, automatically stops quantum breaking RSA.... but maybe the key now is so big, maybe the problem is they have trouble storing on even a huge hard disc, so I dont know exactly what happens, but maybe its in the form of continually refreshing the key, before the quantum breaker can get it, even tho they probably wished it was more qbits.
I've worked on exactly the same thing and I know just how hard it to to explain it to someone else and keeping that in mind I'd say you've done a good job
Can I have your email id
amazing explanation!
Hi Frank, everything in Ep. 5 can be found within the Altpeter chapter shown in the introduction, which is located on the Kwiat group tomography website: research.physics.illinois.edu/QI/Photonics/tomography/ . Nielsen and Chuang is mostly relevant to Ep. 6 (both episodes were originally recorded as a single talk), where chapter 8 contains a theoretical description of quantum processes and a brief discussion on process tomographies. Hope this helps! -Spencer
I am here to understand deep working of adaptive optic :)